Income Taxes - Reconciliation of Changes in Unrecognized Tax Benefits Associated with Uncertain Tax Positions (Detail) - USD ($) $ in Thousands	7 Months Ended	12 Months Ended
Dec. 31, 2015	May. 31, 2015	May. 31, 2014	May. 31, 2013
Reconciliation of Unrecognized Tax Benefits [Line Items]
Balance at beginning of year	$ 477	$ 715	$ 697	$ 624
Additions based on tax positions related to prior years	62	68	110	191
Reductions based on tax positions related to prior years		(306)
Reductions resulting from a lapse of the applicable statute of limitations			(92)	(118)
Balance at end of year	$ 539	$ 477	$ 715	$ 697

Reconciliation of Unrecognized Tax Benefits [Line Items]

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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- Definition

Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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